JPH07170202A - Transmission circuit - Google Patents

Abstract

PURPOSE:To prevent power efficiency from being degraded, current consumption from being increased or output distortion from being enlarged even when a carrier wave signal level is changed by changing a power supply voltage and a bias voltage to be impressed to a power amplifier each time the carrier wave signal level is changed. CONSTITUTION:First of all, a control circuit 16 outputs a voltage source control signal (Vcon) in proportion to a reference voltage (Vref). A constant DC voltage (Vdc) is applied to a variable voltage power source 18, converted into any suitable voltages (Vdd and Vgg) by the control voltage (Vcon) and supplied to a power amplifier 15. There are seven stages in the level of the output voltage (Pout) of the transmission circuit to be used for a portable telephone set and corresponding to the respective levels, the power supply voltage (Vdd) and the bias voltage (Vgg) of the power amplifier 15 are controlled so as not to degrade the power efficiency. This is to decide the control voltage (Vcon) corresponding to the reference voltage (Vref) for deciding the respective levels.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly used in high-frequency band linear power amplifiers, etc., and amplifies a modulated wave in which the level of a carrier wave is variable according to the use condition with high power efficiency.
The present invention relates to a transmission circuit that achieves low current consumption.

[0002]

2. Description of the Related Art A high-frequency linear power amplifier whose operation class is class A or class AB is used for power amplification of a radio device having a transmission circuit. The maximum efficiency of a linear amplifier operating in class A is 50%, and that in class B operation is 78.5%. Therefore, the class B operation is excellent for mobile radios and other devices that require high efficiency operation. In addition, GaAs FETs are mostly used for power amplifiers of portable radios because they have better drain efficiency than Si-MOSFETs and Si-bipolars, but since they are non-linear elements, they have poor linearity in class B operation and distortion components. There are also many. Therefore, the actual operating point may be set between Class A and Class B. Since the voltage applied to the drain of the FET used in the power amplifier is constant,
The drain voltage is determined so that the maximum value of the input power is in the saturation region between class A and class B. Such a power amplifier is
As the input signal level decreases, the drain of the FET
There is a problem that the margin of the source-to-source voltage becomes large, the margin consumes the power in the FET, and the power efficiency decreases.
Considering this, if a class C nonlinear amplifier is designed from the beginning, the efficiency is good, but it cannot be used for a linear amplification system such as PSK. Further, if the class C is used, the distortion component is large and it cannot be applied to a transmission circuit such as a mobile phone which has severe specifications for distortion (spurious). Also, in portable radios, the current consumed by the power amplifier accounts for about 70% of the total, so power efficiency is the most important characteristic. This is directly related to the talk time, and the higher efficiency and lower current consumption You can talk for a long time. Conversely, if the efficiency is low, the battery consumption is high and the heat generation is large, so that there is a problem that the continuous call time is shortened.

Conventionally, AM and π / 4 shift QPS have been used as examples of improving the power efficiency when the modulation wave signal level is low.
When amplifying a modulated wave whose amplitude greatly changes such as K with high efficiency, the output signal (or input / output signal) of the power amplifier is extracted, the power supply voltage of the power amplifier is controlled in proportion to this output signal, and saturation is performed. The power efficiency is improved by making the output level follow the input signal level. This is called an envelope feedback type linear amplification (envelope feedback linear amplifier), and by such control, the high frequency power amplifier is operated linearly while being kept in a saturated state. Therefore, even when the input signal is small, the power amplifier can be operated in a saturated state by changing the power supply voltage according to the change in the input signal, and a large deterioration in power efficiency can be prevented. Further, it is possible to reduce output distortion, which is a problem in a normal saturation type amplifier. In this case, the FM or the like does not pose a problem because the amplitude of the modulated wave is constant. However, even in the FM, the amplitude of the modulated wave is constant, but the carrier signal level (modulated wave signal level) required for transmission is changed according to the use situation by using the transmission output control circuit as in the cellular mobile phone system. In that case, similarly, there is a problem that the power efficiency decreases as the carrier signal level decreases. As shown in FIG. 9, the transmission output control circuit compares the reference voltage from the reference voltage generation circuit (96) with a smoothed voltage obtained by extracting a part of the output of the power amplifier (91) and subjecting it to DC smoothing (9
7) Then, the gain of the power amplifier (91) is varied according to the comparison result to control the output level of the carrier wave. The power supply voltage and the bias voltage supplied to the power amplifier in this case are constant voltages appropriately regulated (98) from a fixed voltage. The gain is controlled by changing the gate voltage of the FET used in the power amplifier.

[0004]

When the carrier signal level (modulated wave signal level) required for transmission is changed according to the use situation by using the transmission output control circuit like the cellular type mobile phone system, the carrier signal is used. If the level is reduced, there is a problem that the drain-source voltage of the FET used for the power amplifier has a margin, the FET consumes the margin, and the power efficiency deteriorates. That is, when the carrier signal level is reduced, the current consumption is larger than when the power efficiency is constant. As a result, in the case of a battery-driven transmitting device such as a portable wireless device, the battery may be consumed so much that the talk time may be shortened.

It is an object of the present invention to provide a transmission circuit that varies the power supply voltage and bias voltage of a power amplifier so that the current consumption when the carrier signal level is reduced by the transmission output control circuit is minimized.

Another object of the present invention is to provide a transmission circuit that varies the power supply voltage and the bias voltage of the power amplifier so as to suppress the deterioration of the power efficiency when the carrier signal level is reduced by the transmission output control circuit. is there.

Still another object of the present invention is to provide a portable circuit equipped with a transmission circuit for varying the power supply voltage and the bias voltage of the power amplifier so that the current consumption when the carrier signal level is reduced by the transmission output control circuit is minimized. To provide a radio.

[0008]

According to the present invention, a control circuit having a function of generating not only a reference voltage for determining a carrier output level of a transmission output control circuit but also a control voltage proportional to the reference voltage. And a transmitter circuit provided with a variable voltage source capable of changing the power supply voltage and the bias voltage supplied to the power amplifier by the control voltage.

Further, according to the present invention, not only the detection circuit for DC-smoothing the power amplifier output of the transmission output control circuit and the reference voltage for determining the carrier output level but also the reference voltage and the detection circuit output are calculated. Provided is a transmission circuit provided with a control circuit for generating a control voltage and a variable voltage source capable of changing a power supply voltage and a bias voltage supplied to a power amplifier by the control voltage.

According to the present invention, the first detection circuit for DC-smoothing the power amplifier input of the transmission output control circuit, the second detection circuit for DC-smoothing the power amplifier output, and the reference for determining the carrier output level. A control circuit that generates not only a voltage but also a control voltage calculated from the reference voltage and the outputs of the first and second detection circuits, and the control voltage that changes the power supply voltage and the bias voltage supplied to the power amplifier. There is provided a transmission circuit provided with a variable voltage source capable of

[0011]

According to the present invention, the transmission output control circuit generates the control voltage proportional to the reference voltage for determining the carrier signal level, thereby controlling the variable voltage source, and controlling the power supply voltage and the bias voltage applied to the power amplifier. Change so that the power amplifier is always in ideal saturation. As a result, it is possible to configure a transmission circuit in which the power efficiency does not deteriorate and the output distortion does not increase even if the carrier signal level changes significantly. In addition, by constantly operating in a saturated state, the current that is wasted is reduced, and by configuring a portable wireless device equipped with the transmitter circuit to improve power efficiency and reduce current consumption, battery consumption is reduced You can lengthen the time.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a configuration example of a transmission circuit according to the present invention. Reference numeral 11 denotes a variable gain power amplifier, which comprises a variable gain drive amplifier 14 for amplifying an input signal with a gain according to a given control voltage and a power amplifier 15 for outputting an output signal proportional to the input signal. Reference numeral 12 is a signal extraction / detection circuit that detects the output (Pout) of the variable gain power amplifier 11, and extracts a part of the high-frequency signal with a directional coupler, a coupling capacitance, etc., smoothes it with the detection circuit, and converts it into a DC voltage. . Variable gain power amplifier 1 output from control circuit 16
A reference voltage (Vref) that determines the output signal level of 1;
The output of the signal extraction / detection circuit 12 is input to the comparison circuit 17, and the gain control voltage (Vapc) is output. The generated gain control voltage (Vapc) is input to the gain control terminal of the variable gain drive amplifier 14. The voltage of each part changes until the error between the output voltage of the signal extraction / detection circuit 12 and the reference voltage (Vref) becomes zero, stabilizes when reaching a predetermined convergence value, and the output of the variable gain power amplifier 11 becomes constant. . When the reference voltage (Vref) that determines the output signal level (Pout) of the variable gain power amplifier 11 is changed, the gain control voltage (Vap) is changed.
c) also changes and the output of the variable gain power amplifier 11 (Pou
t) can be changed. Although the input signal (Pin) of the variable gain power amplifier 11 is always constant, the variable gain drive amplifier 14 amplifies it with an arbitrary gain to an arbitrary signal level. The gain of the power amplifier 15 is constant and outputs a signal proportional to the input. In mobile phones, currently, the output signal level is generally controlled by controlling the input signal level of the power amplifier. Power amplifier 1
The power efficiency (Eff) of 5 is (power efficiency) Eff (%) = ((Pout-Pin) /, where Vdd and Idd are the power supply voltage and current of the power amplifier, respectively.
(Vdd · Idd) × 100≈Pout / (Vdd ·
Idd) × 100. FIG. 6 shows the Pout / I of the variable gain power amplifier 11.
The dd characteristic is shown. The power supply voltage and the bias voltage are constant. From this and the above equation, it can be seen that the power efficiency deteriorates as the input signal level decreases. Further, looking at the input / output characteristics of the power amplifier 15 shown in FIG. 8, when the output signal is large, the power efficiency is 60% or more, but when the output signal is small, the power efficiency suddenly deteriorates. Further, in FIG. 7, when the power supply voltage (Vdd) of the power amplifier is varied to make the input signal constant, the variable range of the output signal is larger than that in FIG. 8 and the power efficiency is good. When the output signal variable range is large and high power efficiency is required such as in a mobile phone, the variable power supply voltage (Vdd) is more advantageous. However, if this is left as it is, it is conceivable that the power supply voltage (Vdd) is reduced when the output signal is small, and the power efficiency is improved but the current consumption is the same or higher. Therefore, the bias voltage of the power amplifier is also changed at the same time to change from the class A operation when the output signal is small to the class B operation or higher to reduce the current consumption.

First, the control circuit 16 causes the reference voltage (Vre
The voltage source control signal (Vcon) proportional to f) is output. The variable voltage power supply 18 is supplied with a constant DC voltage (Vdc), which is converted into an appropriate voltage (Vdd, Vgg) by the control voltage (Vcon) and supplied to the power amplifier 15. The mobile phone has this reference voltage (Vref) discretely, and when the reception level is small due to the distance from the base station, the transmission output, here the output power of the transmission circuit (Po
ut) is increased. Conversely, when the reception level is high, the output power (Pout) is reduced. There are seven levels of output power (Pout) of the transmission circuit used in the mobile phone, and the power supply voltage (Vdd) and bias voltage (Vgg) of the power amplifier 15 are controlled so that the power efficiency does not deteriorate according to each level. To do. This is to determine the control voltage (Vcon) with respect to the reference voltage (Vref) that determines each level. Further, the control voltage (Vcon) is preferably switched at the timing of switching the output power (Pout), that is, at the time of switching to the reference voltage (Vref).

FIG. 2 is a diagram showing another configuration example of the transmission circuit according to the present invention. Although the basic configuration is the same as in FIG. 1, the point is that the power supply voltage (Vdd) and the bias voltage (Vgg) are variable by both the variable gain drive amplifier 24 and the power amplifier 25. The variable gain drive amplifier 24 may be variable only in the power supply voltage (Vdd).

FIG. 3 is a diagram showing still another configuration example of the transmission circuit according to the present invention. Reference numeral 31 is a variable gain power amplifier, which comprises a variable gain drive amplifier 34 that amplifies an input signal with a gain according to a given control voltage, and a power amplifier 35 that outputs an output signal proportional to the input signal. Reference numeral 32 is a signal extraction / detection circuit that detects the output (Pout) of the variable gain power amplifier 31. A part of the high frequency signal is extracted by a directional coupler, a coupling capacitance, etc., and is smoothed by the detection circuit and converted into a DC voltage. . A reference voltage (Vre that determines the output signal level of the variable gain power amplifier 31 output from the control circuit 36).
f) and the output of the signal extraction and detection circuit 32 are input to the comparison circuit 37, and the gain control voltage (Vapc) is output. The generated gain control voltage (Vapc) is input to the gain control terminal of the variable gain drive amplifier 34. Although the input signal (Pin) of the variable gain power amplifier 31 is always constant, it is amplified by the variable gain drive amplifier 34 with an arbitrary gain and becomes an arbitrary signal level. The gain of the power amplifier 35 is constant and outputs a signal proportional to the input. Further, the power efficiency (Eff) of the power amplifier 35 is: Power efficiency Eff (%) = Pout / (Vdd · Id), where Vdd and Idd are the power supply voltage and current of the power amplifier, respectively.
d) x100. When the input signal becomes small, the power efficiency deteriorates.
In order to improve the deterioration of the power efficiency, the control circuit 36 controls the voltage source control signal (V) proportional to the reference voltage (Vref).
con) is output. The control circuit 36 is provided with a correction means, and the reference voltage (Vref) and the signal extraction detection circuit 3
The output power (Pout) is accurately read from the output of 2 and the voltage source control signal (Vcon) is corrected. A constant DC voltage (Vdc) is applied to the variable voltage power supply 38, and an appropriate voltage (Vd) is set according to the control voltage (Vcon).
d, Vgg) and supplies it to the power amplifier 35. The mobile phone has this reference voltage (Vref) discretely, and when the reception level is low due to the distance from the base station, the transmission output, here the output power (Pout) of the transmission circuit is increased. Conversely, when the reception level is high, the output power (Pout) is reduced. There are seven levels of output power (Pout) of the transmission circuit used in the mobile phone,
The power supply voltage (Vdd) of the power amplifier 35 and the bias voltage (Vg) are set so that the power efficiency does not deteriorate depending on each level.
g) is controlled. This means that the control voltage (Vcon) is determined with respect to the reference voltage (Vref) that determines each level, and the control voltage (Vcon) is switched at the output power (Pout) switching timing, that is, the reference voltage (Vref). It is better to do this when switching to).

FIG. 4 is a diagram showing still another configuration example of the transmission circuit according to the present invention. Although the basic configuration is the same as that of FIG. 3, the control circuit 46 inputs the outputs of both the first signal extraction detection circuit 421 and the second signal extraction detection circuit 422,
The gain of the variable gain power amplifier 41 is accurately read from the input power (Pin) and the output power (Pout), and the voltage source control signal (Vcon) is corrected by the correction unit.

FIG. 5 is a diagram showing still another configuration example of the transmission circuit according to the present invention. As an application, an example in which this transmission circuit is used in the transmission section of a mobile phone will be shown. Reference numeral 51 is a variable gain power amplifier HPA (High Power Amplifier).
r), which is a variable gain drive amplifier DA (DriverA) that amplifies an input signal with a gain according to a given control voltage.
mplifier) 54 and a power amplifier PA (Power Amplif) that outputs an output signal proportional to the input signal.
er) 55 and the SAW band limiting filter 510 between its stages
Composed of. 52 is the output (Pout) of the HPA 51
Is a signal extraction and detection circuit that detects a part of a high-frequency signal with a directional coupler, a coupling capacitance, etc., and smoothes it with a detection circuit to convert it into a DC voltage. The output of the signal extraction / detection circuit 52 is input to the control circuit 56 such as an audio processor. A reference voltage (Vref) that determines the output signal level (Pout) of the HPA 51 output from the control circuit 56;
The output of the signal extraction / detection circuit 52 is input to the comparison circuit 57, and the gain control voltage (Vapc) is output. The generated gain control voltage (Vapc) is input to the gain control terminal of the DA 54. As the input signal becomes smaller, the power efficiency deteriorates.
In order to improve this deterioration, the control circuit 56 outputs a voltage source control signal (Vcon) proportional to the reference voltage (Vref). The constant voltage (Vd
c) is given from the battery (Vbatt) of the mobile phone, and the appropriate voltage (Vdd) is set by the control voltage (Vcon).
To PA55. The mobile phone has this reference voltage (Vref) discretely, and when the reception level is low due to the distance from the base station, the transmission output, here the output power (Pout) of the transmission circuit is increased. Conversely, when the reception level is high, the output power (Pout) is reduced. Output power (P
out) has seven levels, and the power supply voltage (Vd) of the PA 55 is set so that the power efficiency does not deteriorate depending on each level.
d) is controlled. This means that the control voltage (Vcon) is determined with respect to the reference voltage (Vref) that determines each level, and the control voltage (Vcon) is switched at the output power (Pout) switching timing, that is, the reference voltage (Vref). ) When switching to. The power output from the transmission circuit is the dielectric filter or SAW511.
The band is limited at and is radiated from the antenna 512.

FIG. 6 shows the output power (Pou) of the conventional transmission circuit.
It is the figure which showed the relationship between t) and consumption current (Idd). In the figure, the horizontal axis is a logarithmic display (dBm), but when converted to a true number (mW), it becomes a substantially straight line. The power efficiency (Eff) is defined as: Power efficiency Eff (%) = Pout / (Vdd · Id), where Vdd and Idd are the power supply voltage and current of the power amplifier, respectively.
d) x100. When the output signal becomes small, Pout / Idd becomes small, and when the power supply voltage (Vdd) is constant, the power efficiency deteriorates. Since the power amplifier is linear, it can be seen that the power efficiency deteriorates as the input power decreases.

FIG. 7 shows the power supply voltage (V) of the power amplifier (PA).
dd) and output power (Pout) and power efficiency (Eff)
It is the figure which showed the relationship of. Further, FIG. 8 shows a power amplifier (P
It is the figure which showed the input-output characteristic (Pin-Pout) of A) and the relationship of power efficiency (Eff). It can be seen from FIG. 11 that the power efficiency increases as the output saturates. To control the output power (Pout), the input power (Pi
n), the power supply voltage (Vd
There is a method of controlling d). By comparison, there is not much difference near the saturated output, but the difference appears when the output becomes smaller. For example, in FIG. 7, the frequency f = 836.5 MHz,
Input power Pin = −7 dBm, and output power P
The power efficiency when obtaining out = 30 dBm is about 52%. Further, FIG. 8 shows the condition of the frequency f = 836.5 MHz and the power supply voltage Vdd = 5.8 V, and the output power Pout =
The power efficiency when obtaining 30 dBm is about 48%. That is, in the power amplifier (PA) alone, the power efficiency is better when the power supply voltage Vdd is variable.

FIG. 9 is a diagram showing a conventional transmission circuit.
Reference numeral 91 denotes a variable gain power amplifier, which includes a variable gain drive amplifier 94 and a power amplifier 95. A signal extraction / detection circuit 92 is provided at the output of the variable gain power amplifier 91, and a part of the output signal is extracted and converted into a smoothed voltage. The control voltage generation circuit 93 inputs the smoothed voltage, compares it with the internal reference voltage, and inputs the comparison result to the gain control terminal of the variable gain drive amplifier 94. This operation determines the output power and makes it stable. Further, the output power can be changed by changing the reference voltage generated inside the control voltage generating circuit 93. Further, the power amplifier 95 is supplied with a constant power supply voltage (Vdd) and a bias voltage (Vgg) that are appropriately regulated from a fixed voltage (Vdc).

FIG. 10 is a flow chart showing an example of control of a variable voltage power supply when the transmission circuit of the present invention is applied to a mobile phone. As an example, the cellular mobile phone system (N
The call process in the case of the TACS method) is shown. The operation of the mobile station controlled by the base station and the control of the variable voltage source will be described below. In the call process, tasks (1) to (m-1) perform initialization and channel electric field strength check. Task (m) waits for a command from the base station in the case of call origination or call answering access (waitin
g for Order Task, or Waiti
ng forAnswer Task, or Conv
(Easation Task). Output power change request from base station (1010) Order qualifying
If there is an application code (time t = t1), the mobile station receives it and changes the reference voltage (Vref) that determines the output power level in the control circuit (104c) to t = t11 (t1 ≦ t11), and t At t12, the output power becomes stable. As a guide for stability, the output power is changed within ± 3 dB of the set output power within 2 msec after changing the reference power (Vref) (frequency is ± 0.75 p
It is decided to enter (within pm). Therefore t12-
It is possible to set t11 = 2 msec. The control voltage (Vcon) of the variable voltage source that supplies the power supply voltage (Vdd) and the bias voltage (Vgg) of the power amplifier according to the present invention is changed at the same time as or after the reference voltage is changed.
≦ t21). When the output power change is completed, the mobile station sends an ACK message or Order Conf.
send the animation message to the base station t = t2
However, the time t = t22 (until the level fluctuation is within ± 3 dB) by changing the variable voltage source to stabilize the power amplifier is completed before the message is transmitted (t22).
≤t2). That is, the relationship of t1 ≦ t11 ≦ t21, t22 ≦ t2 is required, and by doing so, output distortion that occurs when the power supply voltage of the power amplifier is changed, that is, spurious at the antenna end is suppressed. Further, if it is desired to suppress spurious, the time (t11 ≦ t ≦) until the reference voltage (Vref) is changed and the output power becomes stable.
It suffices that the time (t21 ≦ t ≦ t22) during which the control voltage (Vcon) is changed and the power amplifier becomes stable is included in t12). That is, the relationship of t1 ≦ t11 ≦ t21 ≦ t22 ≦ t12 ≦ t2 is required. At this time, spurious at the antenna end due to the control of the present invention can be minimized.

FIG. 11 is a flow chart showing another control example of the variable voltage power supply when the transmission circuit of the present invention is applied to a mobile phone. As an example, the call process in the case of the cellular mobile phone system (NTACS system) is shown.
The operation of the mobile station controlled by the base station and the control of the variable voltage source will be described below. Task (1) in the call process
From task (m-1), initialization and channel electric field strength check are performed. Task (m) waits for a command from the base station in the case of call or call answering access (Wait
ing for Order Task, or Con
version Task). If there is a handoff request (1110) from the base station, the mobile station enters the handoff process (114a). First Hansoff
The Confirmation Order is sent to the base station, then the transmission output is turned off (t = t1), and the transmission output is set (PL). The mobile station receives it and t = t1
The control circuit (114c) changes the reference voltage (Vref) that determines the output power level to 1 (t1 ≦ t11).
The control voltage (Vcon) of the variable voltage source that supplies the power supply voltage (Vdd) and the bias voltage (Vgg) of the power amplifier according to the present invention is changed at the same time as or after the reference voltage is changed to t = t21 (t11 ≦ t21). The power amplifier is changed to stabilize at time t = t22 (until the level fluctuation is within ± 3 dB). The mobile station uses the hand-in process (11
4b), the time to turn on the transmission output next (t =
By t2) the power amplifier is stable. That is, the relationship of t1 ≦ t11 ≦ t21 ≦ t22 ≦ t2 is required. At this time, there is no increase in spurious at the antenna end due to the control of the present invention,
Only the efficiency of the power amplifier will be improved.

[0023]

The power supply voltage and bias voltage applied to the power amplifier are changed every time the carrier signal level is changed by the transmission output control circuit, and the power amplifier is always in an ideal saturation state, whereby the carrier signal level is changed. However, it is possible to configure a transmission circuit that does not deteriorate power efficiency, increase current consumption, or increase output distortion. In addition, a low-distortion linear amplifier can be configured by including this transmission circuit. Further, by configuring the portable wireless device, it is possible to suppress battery consumption and prolong the call time.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a transmission circuit according to the present invention.

FIG. 2 is a diagram showing another configuration example of the transmission circuit according to the present invention.

FIG. 3 is a diagram showing still another configuration example of the transmission circuit according to the present invention.

FIG. 4 is a diagram showing still another configuration example of the transmission circuit according to the present invention.

FIG. 5 is a diagram showing still another configuration example of the transmission circuit according to the present invention.

FIG. 6 is a diagram showing a relationship between output power and current consumption of a conventional transmission circuit.

FIG. 7 is a diagram showing the relationship between the power supply voltage of the power amplifier and the output power.

FIG. 8 is a diagram showing input / output characteristics of a power amplifier.

FIG. 9 is a diagram showing a conventional transmission circuit.

FIG. 10 is a flowchart showing a control example of a variable voltage power supply when the transmission circuit of the present invention is applied to a mobile phone.

FIG. 11 is a flowchart showing another control example of the variable voltage power supply when the transmission circuit of the present invention is applied to a mobile phone.

[Explanation of symbols]

 11 ... Variable gain power amplifier, 12 ... Signal extraction detection circuit, 14 ... Variable gain drive amplifier, 15 ... Power amplifier, 16 ... Control circuit, 17 ... Voltage comparator, 18 ... Variable voltage power supply, 21 ... Variable gain power amplifier, 22 ... Signal extraction detection circuit, 24 ... Variable gain drive amplifier, 25 ... Power amplifier, 26 ... Control circuit, 27 ... Voltage comparator, 28 ... Variable voltage power supply, 31 ... Variable gain power amplifier, 32 ... Signal extraction detection circuit, 34 ... Variable gain drive amplifier, 35 ... Power amplifier, 36 ... Control circuit, 37 ... Voltage comparator, 38 ... Variable voltage power supply, 41 ... Variable gain power amplifier, 44 ... Variable gain drive amplifier, 45 ... Power amplifier, 46 ... Control circuit, 47 ... Voltage comparator, 48 ... Variable voltage power supply, 51 ... Variable gain power amplifier, 52 ... Signal extraction detection circuit, 53 ... Control voltage generation circuit, 54 Variable gain drive amplifier, 55 ... Power amplifier, 56 ... Control circuit, 57 ... Voltage comparator, 58 ... Variable voltage power supply, 59 ... Battery, 91 ... Variable gain power amplifier, 92 ... Signal extraction detection circuit, 94 ... Variable gain drive Amplifier, 95 ... Power amplifier, 96 ... Control circuit, 97 ... Voltage comparator, 98 ... Voltage power supply, 101 ... Mobile station call process processing flow, 102 ... Task (1), 103 ... Task (m-1), 104 ... task (m), 104a ... output power change processing, 104c ... output power control circuit in mobile station, 105 ... task (m + 1), 106 ... task (n), 107 ... mobile station call process end, 109 ... base station Call process processing flow, 111 ... Mobile station call process processing flow, 112 ... Task (1), 113 ... Task (m-1), 1 14 ... Task (m), 114a ... Handoff processing, 114b ... Handin processing, 114c ... Output power control circuit in mobile station, 115 ... Task (m + 1), 116 ... Task (n), 117 ... End of mobile station call process, 119 ... Base station call process processing flow, 421 ... First signal extraction detection circuit, 422 ... Second signal extraction detection circuit, 510 ... First filter, 511 ... Second filter, 512 ... Antenna, 513 ... Mobile phone main unit, 1010 ... Output power change request, 1011 ... Base station call process end, 1110 ... Handoff request, 1111 ... Base station call process end.

Claims (9)

[Claims] 1. At least a variable gain power amplifier (11).
And a signal extraction / detection circuit (12) and a control circuit (16)
In a transmission circuit including a voltage comparator (17) and a variable voltage power supply (18), the variable gain power amplifier (11) outputs at least the variable gain drive amplifier (14) and the output of the variable gain drive amplifier. The signal extraction / detection circuit (12) extracts a part of the output signal of the variable gain power amplifier (11), performs DC smoothing and outputs the output signal, and the control circuit (16) ) Is the variable gain power amplifier (1
Reference voltage (Vref) that determines the output signal level of 1)
And a voltage source control signal (Vcon) is generated, and the voltage comparator (17) outputs the signal extraction detection circuit (1
2) The output and the reference voltage (V
ref) is input and the result of comparing the voltage values (Vap
c) is the variable gain drive amplifier (14) for gain control
The variable voltage power supply (18) receives the voltage source control signal (Vcon) output from the control circuit (16) and outputs a fixed DC voltage (Vdc) according to the signal (Vcon). Power supply voltage (Vdd) and bias voltage (Vgg) are supplied to the power amplifier (15), respectively, and the reference voltage (Vref) is set so that the consumption current of the variable gain power amplifier (11) is always minimized. A transmission circuit having a control circuit for generating a voltage source control signal (Vcon) in response thereto. 2. The transmission circuit according to claim 1, wherein a voltage source control signal (Vcon) is generated according to a reference voltage (Vref) so that the power efficiency of the variable gain power amplifier (11) is maximized. A transmitter circuit having a control circuit. 3. At least a variable gain power amplifier (21)
And a signal extraction / detection circuit (22) and a control circuit (26)
The variable gain power amplifier (21) according to claim 1, comprising: a voltage comparator (27); and a variable voltage power supply (28). The signal extraction and detection circuit (22) is configured by a power amplifier (25) for inputting the output of a gain drive amplifier, and the signal extraction and detection circuit (22) extracts and outputs a part of the output signal of the variable gain power amplifier (21), A circuit (26) includes the variable gain power amplifier (2
Reference voltage (Vref) that determines the output signal level of 1)
And a voltage source control signal (Vcon) is generated, and the voltage comparator (27) outputs the signal extraction detection circuit (2).
2) The output and the reference signal (V
ref) is input and the result of comparing the voltage values (Vap
c) is the variable gain drive amplifier (24) for gain control
The variable voltage power supply (28) receives the voltage source control signal (Vcon) output from the control circuit (26) and outputs a fixed DC voltage (Vdc) according to the signal. (Vdd) and a bias voltage (Vgg), and the power supply voltage (Vdd) is supplied to a power amplifier (25) and a variable gain drive amplifier (24).
g) is supplied to the power amplifier (25) and generates a voltage source control signal (Vcon) according to the reference voltage (Vref) so that the consumption current of the variable gain power amplifier (21) is always minimized. A transmitter circuit having a circuit. 4. At least a variable gain power amplifier (31)
And a signal extraction / detection circuit (32) and a control circuit (36)
The variable gain power amplifier (31) comprises at least a variable gain driving circuit (37) and a variable voltage power supply (38). It is composed of an amplifier (34) and a power amplifier (35) for inputting the output of the variable gain drive amplifier, and the signal extraction / detection circuit (32) receives the output of the variable gain power amplifier (31) and outputs the output signal. Extract a part of
The direct current is smoothed and output to the control circuit (36), and the control circuit (36) outputs the variable gain power amplifier (3
Reference voltage (Vref) that determines the output signal level of 1),
And a voltage source control signal (Vco) calculated from the output of the signal extraction / detection circuit (32) and a reference voltage (Vref).
n), the voltage comparator (37) outputs the signal extraction detection circuit (3).
2) The output and the reference signal (V
ref) is input and the result of comparing the voltage values (Vap
c) is a variable gain drive amplifier (34) for gain control
The variable voltage power source (38) inputs a voltage source control signal (Vcon) output from the control circuit (36), and outputs a fixed DC voltage (Vdc) according to the signal to an arbitrary power source voltage. (Vdd) and bias voltage (Vgg) and supplied to the power amplifier (35), respectively, so that the current consumption of the variable gain power amplifier (31) is always minimized. A transmission circuit having a control circuit for generating a voltage source control signal (Vcon) according to an output of the circuit (32). 5. At least a variable gain power amplifier (41)
And a first signal extraction detection circuit (421), a second signal extraction detection circuit (422), a control circuit (46), a voltage comparator (47), and a variable voltage power supply (48). The transmission circuit according to any one of claims 1 to 4, wherein the variable gain power amplifier (41) inputs at least the variable gain drive amplifier (44) and the output of the variable gain drive amplifier (45). ), The first signal extraction detection circuit (421) is provided at the input of the variable gain power amplifier (41), extracts a part of the input signal, performs DC smoothing, and outputs the second signal. The signal extraction / detection circuit (422) of (1) receives the output of the variable gain power amplifier (41), extracts a part of the output signal, performs DC smoothing and outputs, and the control circuit (46) outputs the variable gain. Power amplifier (4
Reference voltage (Vref) that determines the output signal level of 1),
And a voltage source control signal (Vcon) calculated from the output of the first signal extraction detection circuit (421), the output of the second signal extraction detection circuit (422) and a reference voltage, and the voltage comparator (47) inputs the output of the second signal extraction detection circuit (422) and the reference voltage (Vref) of the output of the control circuit (46), and compares the voltage values (Vapc) is the gain control result. Therefore, the variable voltage drive amplifier (44) is input to the variable voltage power supply (48), and the voltage source control signal (Vcon) output from the control circuit (46) is input to the variable voltage power supply (48). The voltage (Vdc) is converted into an arbitrary power supply voltage (Vdd) and bias voltage (Vgg) and supplied to each power amplifier (45) so that the current consumption of the variable gain power amplifier (41) is always minimized. Basis Voltage (Vref), the first signal extraction detection circuit (421) output, and the second signal extraction detection circuit (422) the voltage source control signal in response to the output (Vco
A transmission circuit having a control circuit for generating n). 6. A signal transmitting device, a portable wireless terminal device, or a mobile phone, comprising the transmitting circuit according to any one of claims 1 to 5. 7. A mobile radio terminal device or a mobile phone comprising the transmission circuit according to claim 6, wherein the power supply voltage of the power amplifier is stable after the control voltage (Vcon) is changed, and the output signal level is changed. Fluctuation ± 3
The signal level change request signal t from the base station controlling the terminal is the period t21 to t22 until it falls within dB.
A portable wireless terminal device or a portable telephone characterized in that t1 ≦ t21 <t22 ≦ t2 included within a period from 1 to a change completion signal t2 from the terminal to the base station. 8. A mobile radio terminal device or a mobile phone comprising the transmission circuit according to claim 6 or 7, wherein the power supply voltage of the power amplifier is stabilized after the control voltage (Vcon) is changed, and an output signal is output. Fluctuation of ± 3
The period t21 to t22 until it falls within dB is included in the period t11 to t12 (2 msec) in which the output level should be stable after the reference voltage (Vref) is changed t11 ≦ t21 <t22 ≦ t12; t22− t21 = 2
A mobile wireless terminal device or mobile phone characterized by msec. 9. A mobile radio terminal device or a mobile phone comprising the transmission circuit according to claim 6, wherein the power supply voltage of the power amplifier is stabilized after the control voltage (Vcon) is changed, and the output signal level is changed. Fluctuation ± 3
The period t21 to t22 until it falls within dB is included in the period t1 to t2 from when the output power is temporarily turned off until it is turned on again. t1 ≦ t21 <t22 ≦ t2 Telephone.